Could it be the encoding of the file an issue? So then when you open it in the Shopify's code editor and save it, the encoding is corrected?

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Sorry for the wait. Have you tried removing the `@charset` expression from the top of the file? I'm not very well versed in themes, but there definitely seems to be some kind of encoding issue on our end which I can see in my logs (we're expecting something on our end to be a byte string but it's UTF-8 instead). That doesn't mean you need to set another charset necessarily, so just try without that for now.

Sorry for the delay. I'm not having too much luck on my end determining the exact cause of the issue. Would you mind providing me with a gist of the raw request you're making? Something I could use to replicate myself would be most ideal in this case if possible.